#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
#include <uv.h>  
#include <iostream> 
 
#define DEFAULT_PORT 7000  
#define DEFAULT_BACKLOG 128  
  
uv_loop_t *loop;  
struct sockaddr_in addr;  
  
void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {  
    buf->base = (char*) malloc(suggested_size);  
    buf->len = suggested_size;  
}  
  
void echo_write(uv_write_t *req, int status) {  
    if (status) {  
        fprintf(stderr, "Write error %s\n", uv_strerror(status));  
    }  
    free(req);  
}  
  
void echo_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {  
    if (nread < 0) {  
        if (nread != UV_EOF)  
            fprintf(stderr, "Read error %s\n", uv_err_name(nread));  
        uv_close((uv_handle_t*) client, NULL);  
    } else if (nread > 0) {  
        /*uv_write_t *req = (uv_write_t *) malloc(sizeof(uv_write_t)); 
        uv_buf_t wrbuf = uv_buf_init(buf->base, nread); 
        uv_write(req, client, &wrbuf, 1, echo_write);*/  
    }  
      
    printf("echo_read:%s\r\n",buf->base);  
    if (buf->base)  
        free(buf->base);  
}  
  
void on_new_connection(uv_stream_t *server, int status) {  
    if (status < 0) {  
        fprintf(stderr, "New connection error %s\n", uv_strerror(status));  
        // error!  
        return;  
    }  
      
    uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));  
    uv_tcp_init(loop, client);  
    if (uv_accept(server, (uv_stream_t*) client) == 0) {  
        uv_read_start((uv_stream_t*) client, alloc_buffer, echo_read);  
    }  
    else {  
        uv_close((uv_handle_t*) client, NULL);  
    }  
    printf("on new connection, status:%d\r\n", status);  
}  
  
int main() {  
    printf("buliding tcp\n");  
    loop = uv_default_loop();  
      
    uv_tcp_t server;  
    uv_tcp_init(loop, &server);  
      
    printf("port%d", DEFAULT_PORT);  
      
    uv_ip4_addr("0.0.0.0", DEFAULT_PORT, &addr);  
      
    uv_tcp_bind(&server, (const struct sockaddr*)&addr, 0);  
    printf("listening %d\n", DEFAULT_PORT);  
    int r = uv_listen((uv_stream_t*) &server, DEFAULT_BACKLOG, on_new_connection);  
    if (r) {  
        fprintf(stderr, "Listen error %s\n", uv_strerror(r));  
        return 1;  
    }  
    return uv_run(loop, UV_RUN_DEFAULT);  
} 
